perl.h: Add EXTERN_C for flock()

This was failing to load on Solaris with g++

Thanks to Dagfinn Ilmari Mannsåker for figuring this out.

1 files changed, 1 insertions, 1 deletions

diff --git a/perl.h b/perl.h
index 57b9d2b53a..7fbbd59a38 100644
--- a/perl.h
+++ b/perl.h
@@ -7060,7 +7060,7 @@ C<strtoul>.
 #endif
 
 #if defined(HAS_FLOCK) && !defined(HAS_FLOCK_PROTO)
-int flock(int fd, int op);
+EXTERN_C int flock(int fd, int op);
 #endif
 
 #ifndef O_RDONLY